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Experiences with Thermal Spray Zinc Duplex Coatings on Road Bridges

机译：公路桥梁热喷涂锌双相涂层的经验

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摘要

Road bridges are typically designed with a 100-year lifetime, so protective coatings with very long durability are desired. Thermal spray zinc (TSZ) duplex coatings have proven to be very durable. The Norwegian Public Roads Administration (NPRA) has specified TSZ duplex coatings for protection of steel bridges since 1965. In this study, the performance of TSZ duplex coatings on 61 steel bridges has been analyzed. Based on corrosivity measurements on five bridges, a corrosivity category was estimated for each bridge in the study. Coating performance was evaluated from pictures taken by the NPRA during routine inspections of the bridges. The results show that very long lifetimes can be achieved with TSZ duplex coatings. There are examples of 50-year old bridges with duplex coatings in good condition. Even in very corrosive environments, more than 40-year old coatings are still in good condition. While there are a few bridges in this study where the coating failed after only about 20 years, the typical coating failures are due to application errors, low paint film thickness and saponification of the paint. Modern bridge designs and improved coating systems are assumed to increase the duplex coating lifetime on bridges even further.
机译：公路桥梁通常设计有100年的使用寿命，因此需要具有非常长的耐久性的防护涂料。热喷涂锌（TSZ）双相涂层已被证明非常耐用。自1965年以来，挪威公共道路管理局（NPRA）就指定了TSZ双层涂料来保护钢桥。在这项研究中，已经分析了TSZ双层涂料在61个钢桥上的性能。根据对五座桥梁的腐蚀测量结果，估算研究中每座桥梁的腐蚀类别。 NPRA在桥梁的常规检查过程中通过图片评估了涂层性能。结果表明，使用TSZ双相涂层可以实现非常长的使用寿命。已有50年历史的双相涂层桥梁状况良好的例子。即使在腐蚀性很强的环境中，超过40年的旧涂层仍处于良好状态。尽管在这项研究中有一些桥梁，仅仅20年后涂层就失效了，但典型的涂层失效是由于施涂错误，漆膜厚度低和皂化作用引起的。假定现代桥梁设计和改进的涂层系统可以进一步延长桥梁的双相涂层寿命。

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